Stiffness Laws and Low Dynamic Design of Urban Rail No.14 Turnout Track
In order to study the distribution laws of stiffness of domestic No.14 ballastless turnout track with higher lateral turnout-crossing speed,a stiffness calculation model for urban rail No.14 turnout track was established based on finite element theory.The model fully considers the influence of components such as under-rail rubber pads,under-plate rubber pads,rail types,and sliding platforms.The focus is on analyzing the variation laws of the overall longitudinal distribution of stiffness of No.14 turnout,and low dynamic design was carried out to address the uneven distribution of track stiffness.The results show that the vertical stiffness of the urban rail No.14 single turnout track is unevenly distributed along the longitudinal direction of the line,with the minimum stiffness in the connecting part,the maximum stiffness in the turnout part is 1.5 times that of the connecting part,and the maximum stiffness in the frog part is 2.0 times that of the connecting part.Through low dynamic design,the maximum longitudinal change rate of the overall stiffness of the steel rail has been reduced from 207.4%to 121.6%,and the deflection change rate of the steel rail has been reduced to within 0.3 mm/m,which can meet the transportation organization requirements of the urban rail No.14 turnout.
subwaytrack stiffnessnumerical calculationturnoutlow power design
万方数据
维普
